Finishing tool



Dec. 27, 1932. HOPE 1,891,985

FINI'SHING TOOL A Filed Jan. 12, 1929 /NVE/WUR- MM @y A W www# ' an application of William A. Reed.

Patented Dec, 27, 1932 UNITED PATENT QFFCE ERNEST Horn, or Lnrus'ren, susanne, asseivor.. To UNITED snor MACHINERY marokanen 011? Maassen NEW A CORPORATION 0F NEW JERSEY rrnrsnrive :voorJ Application filed January 12, 1923, Serial No. 332,?203, andI in Great Britain January 17, 191248,

This invention relates. to finishing tools and is herein illustrated as embodied in a bullies i011 f a type employed extensively in the manufaeture of beets shees- The invention is, however, applicable to tools of other types and designed for performing other operations.

In rolls of the type above mentioned the abrasive material iS usually supplied in the form of an abrasive sheet, such as sandparer, which iS Wrapped around the roll and constitutes an abrasive cover therefor, It has been customary to hold such an abrasive cover in place upon the roll by a series of paper-clamping hooks inserted radially into the body of the roll and arranged to be drawn down tightly against an edge of the abrasive cover to clamp it in place, the hooks being controlled through an actuator disposed within the body or the roll. One such construction which has been used extensively and with a high degree of success is illustrated in United States Letters Patent No. 1,014,094, granted January 9, 1912 ,upon

One advantage ot that arrangement resides the fact that it provides a device for detachably securing the hooks to an actuator bar se that broken hooks may be replaced Without necessitating the disassembling of the roll as a whole.

One of the objects of the present invention is to provide a finishing tool of the type disclosed in the above-mentioned Letters Patent with improved means for clamping and ten sioning the abrasive cover. In accordance with this object, one feature of the invention consists in the provision of a pair of clamping jawsl disposed respectively inside and Outside of a yieldable cover which surrounds the roll body and which cushions the abrasive cover, the jaws being constructed and arranged to grip the yieldable cover as well as the abrasive cover to insure holding the abrasive cover firmly without danger of cracking it. Y

In the illustrated construction, as in the construction disclosed in the Letters Patent referred to, the individual clamping ihooks are removably connected yto the actuator bar inside the roll by means of a locking member which may be reached from the exterior of the roll and moved in one direction or the other to release the hooks from or to lock them to the actuator bar. In accordance with a further feature of the invention, the illustrated locking member plate or bar having recesses is made in thel form of a steel plate having notches at its edge to allow the insertion of the hooks and arranged to be moved longitudinally to engage the unrecessed portions of thel locking bar in suitable lateral'recesses in the shanlrs of the hooks thereby to lock each of the hooks to the actuator bar.`

The above and other features of the invention, including details ofl construction, will now be more particularly described with reference to the accompanying drawing, in which,

Fig. 1 is a longitudinal view, partly in section, of an abrading tool embodying the invention in a preferred form;

Fig. 2 is an end view of the tool illustrated in Fiel;

Fig. 3 is an enlarged, fragmentary, transverse sectional view taken on the line lll-III of Fig. 1;' i

Fig. t is a plan view of the hook shown in Fig. 3;

Fig. 5 is an end view of a device for holding the tool against rotation; and

Fig. 6 is a fragmentary plan view of the abrasive cover before being applied to' the tool.

The illustrated abrading tool includes a cylindrical wooden core 10 (Fig. 1) surrounded by a resilient cover 12 of felt, the core 10 being supported at its ends-by heads 1a carried upon a power driven shaft 1.6. The core 10, the cover 12 and the heads 141 together constitute roll body which is held against longitudinal movement with respect to the shaft 16 by means of collars 18. Cam grooves 2O are `formed in the collars 18 for a. purpose presently to be described. Concealed spring-pressed latches 22 are provided to prevent rotation of the roll body with respect to the collars 18 and the shaft 16 although the latches 22 may be released, to permit, for a purpose later to be described, a

limited rotation of the roll body with respect to the colla-rs and the shaft, by means of a manually operated plunger 24 which is slidably mounted in one of the. collars 18 to a position where it may be depressed to release either ot the latches 22. TheV structure so far described is substantially likeV the corresponding parts described and illustrated in the above-mentioned Letters Patent No. 1,014,094, to which reference may be had tor a more complete disclosure.

An outer covering 26 or any suitable sott yieldable material is wrappedv several times about the telt cover l2, to which it sccured by stitching orby othcrsuitab-le means. Upon the'outer cover 26 is carried an abrasive cover 28. The outer cover 26 softens 'the action of the abrasive cover upon the work and adds materially tol the life of the abrasive cover. lt also assists clamping devices, later to be described, in holdingy the abrasive cover firmly upon the roll bony without danger ojl" cracking the abrasive cover. y y

T he abrasive cover 28 is retained upon the roll body by means ot clamping hooks 30 (Fig. 8) together withco-operatingmechanismpresently to be described. Each hook 3() consists of a substantially straight stem or shank 82 having a rectangular cross-section and a cover clamping jaw 34, the jaw extending'substantially at a right angle to the shank. The hooks 30 arerdisposed along the length of the roll body, and they are moved into and out of clamping positionand also retained in clamping position by means of an actuator bar 36 (Figs. l and 8 which entends lengthwise of the roll body. rlhe ends ot the actuator bar 36 engage the respective cam slots 2O of therespective collars i8, and the actuator bar 86 is thus normally held in cover clamping position by one or thc'latches 22. Upon unlatching the roll body, and rotating it relatively to the shaft 16, the actuator bar 36 will be moved into and out of clamping position, in the manner described in the aforementioned Letters Patent llo. 1,014,094; rEhe actuator bar 86 is r cessed to provide a socket 88 to receive the shank 32 oit each hook 30. For locking the hooks 36 to the actuator bar 36 each oi the Shanks 82has a recess 40 in the i'orm ot a. rectangular notch which is engaged by a locking oar 42 termed ot steel plate, the latter oeing slidably carried in a longitudinal recess or groove formed in the actuator bar 36. The edge of the lociring` bar which engages the notches 40 is itself notched away at 4l (Fig. l) adjacent each of the shanks 32, `so that a .slight longitudinal Y. m vement of the locking bar 42 in the actuating bar 36, in one direction or the other, will serve to lock or to unlock all oi the hooks 30 simultaneously. The locking bar 42 may be shifted longitudinally to lock or unlock the hooks 30 by means or" any simple tool, such as a screw driver, which may be pushed against either end of the locking bar 42. ln order to permit access of the aforementioned tool, small openings 48 are provided in each of the collars l8 at the outer ends o'li the cam slots 20. In order to facilitate the positioning of the Shanks 32 in their respective sockets 38 so that the notches 40 will registerwith the locking bar 42, an abutment 44 carried by the actuator bar 36 extends into each socket 88 and engages the base of each shank 32.

i A yielding abutment in the form of ai co-operating clamping jaw 46 (Fig. 3) is provided for each of the hooks 30. Each clampingjaw 46 is iXed uponthe outer end or' a plunger 48 which is guided for movement inwardly and outwardly ot the rollbodyby'a bushing 5() threaded in the core l0. Each plunger 48 is urged outwardly of the roll body by a helical spring 52 which surrounds the plunger 48 and `is compressed between a shoulder 54 on the plunger and an internal flange 56 upon the base of the bushing. A stop bar 58 extends through a hole in each ofthe plunger-s 48 adjacent to the base thereof and, by engaging the base of each ot `the bushings 50, the stop bar 58 limits the outward movement ot each plunger 48 so that the engaging4 tace of each jaw 46 may be spaced Jfrom the axis or' the roll body at substantially the same radial distance as the outer surface ofthe telt cover l2.

As shown in Fig. 3, the co-operating jaws 34'and 46 extend.circumferentially of the roll body. The jaw 46 -overhangs the top ol the plunger 48, and the overhanging portion of the jaw 46 has a recess in the form oi? a hole to permit the shank 32 to pass therethrough. Both jaws 34 and 46 have their `engaging acescurved to conform to the general curvature ol the roll body, the engaging face of the jaw 46 being also concave in a plane longitudinal of the roll body (Fig. l) to form depressions into which the hook jaws 34' may snugly press portions of the abrasive cover 28 and the outer cover 26. The telt cover l2 has recesses 60 to accommodate the plungers 48 together with the respective jaws 46 and Shanks 32. The outercover 26 is not thus recessed, but has a smallhole to accommodate each of the Shanks 82, sothat the outer 'cover' 26, as above stated, is gripped between the jaws 34 and 46 andthus serves to cushion the abrasive cover 28 at the points where the latter is clamped, providing a firm grip for the abrasive cover and minimizingV any danger or tearing orV cracking the latter at the points where it is gripped. yThe hook jaw 34 is relatively narrow at vits junction with the shank 32 (Fig. 4) and is relatively wide at its free end. The jaw 34 (Fig. 3) is also fiattened out as its tree end is approached. The core 10 has a longitudinal recess 62 to accommodate the actuating bar 86.

The clamping hooks 30 arenot spaced at uniform distances from each other, as has been customary in rolls l hitherto ymanu- CII,

llO

factured, but are spaced closer together adjacent to the middle portions of the roll than at the ends of the roll, as shown in Fig. 1. By spacing the hooks more closely together adjacent to the middle portion of the roll, which is the portion that receives the greatest use, any tendency on the part of the abrasive cover to become loose and, therefore, to wear away rapidly at this portion is obviater and the life of the cover is thereby prolonged,

The abrasive cover 28 is provided in sheet form and is wrapped about the roll body over the flannel cover 26 with one of the two edges of the abrasive cover overlapping the other. Before the abrasive cover 28 is applied to the roll body, a plurality of apertures 64 are formed in it in a line extending lengthwise of the sheet and adjacent to the edge which is to be overlapped. The apertures G4; are of sufficient size to permit threading the sheet over the widest portion of the hcolr jaws 34;, and they are spaced to conform to the spacing of the hooks 30; that is, the apertures 64 which are adjacent to the middle portion of i the sheet 28 are spaced closer together than the apertures 64 adjacent tothe end portions of the sheet 28.

pulley 66 secured to the shaft 16 is connected in the usual manner by a belt to any convenient source of power for driving the roll. In order to hold the shaft 16 against accidental movements when the roll is not in operation and while a fresh cover 28 is being applied to the roll, the pulley 6G has formed in its )eriphery a radially extending notch 68. A latch is pivoted upon a stationary member 72, which may be a part of the machine frame. in such manner as to enable the latch 70 to 'be swung into engagement with the notch 68 and thus hold the shaft 16 and the roll stationary. The engaging end of the latch T0 is made suiiiciently long to accommodate the notch 68 in any of the various positions the pulley G6 in cases where the shaft 16 is reciprocate-d axially in addition to being rotated.

Assuming the roll to be in operation, and the. abrasive cover 28 to be sufficiently worn to require replacement, the rotation of the roll is first stopped by manipulation of the usual clutch interposed between the pulley 66 and the sour-ce of power. The roll is rotates \y hand to bring the notch 68 of the pulley G6 into a position for engagement with' the latch Cf'O, whereupon the latch 70 is swung into latchinp position to hold the shaft 11i against accident-al rotation. The hooks 30 and plungers #i8 are still in cover clamping position, as shown in Fig. 1. rllhe abrasive cover 28 is now unclamped by rotating the roll body, as shown in Fig. 2, in a clockwise direction. The ends of the actuator bar 36 are forced outwardly by the cam slots 20, causing the entire actuator bar to move outwardly, until the ends of the actuator bar engage the outer ends of the slots 20. The outward movement of the actuator bar raises all of the hooks 30. rlhe plungers 48, being urged outwardly by the springs 52, follow the hooks for ay short distance but are stopped by the bar 58. The old abrasive cover 28 may then be removed from the roll. Any of the hooks .-30 may be replaced at this time, if desired, by inserting a small tool, such as a screw driver, through the hole d3 in one of the collars 18 and pushing the locking bar 42 longitudinally until the notches in the engaging face of the locking bar are in register with the hook Shanks 32, Vhen new hoolrs have been inserted, the above-mentioned tool may be applied to the opposite end of the locking bar 12 through the hole 13 in the other collar 18 to push the locking bar into locking position. A new abrasive cover 28 is threaded, adjacent to one of its edges, over the hooks 30, and is then wrapped smoothly upon the roll with its other edge overlapping the firstmentioned edge. The roll is then rotated in a countercloclwise direction, as viewed in F ig. 2, until the ends of the actuator bar 86 engage the inner ends of the cam slots 20, whereupon the latch 22 operates to lock the roll in operative position. During the inward movement of the actuator bar 36 the hook jaws Se move inwardly and clamp the abrasive cover 28 and the outer cover 26 against the plunger jaws e6. The inward movement of the hoolrs 8O forces the plungers i8 inwardly, and the abrasive cover 28 is, by reason of this inward movement of the cooperating sets of jaws, tensioned circumferentially of the roll, and the outer surfaces of the jaws Sel are brought within the general circumference of the roll body.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. iin abrading tool comprising a supporting body, a cover of yieldable material for said body, said body and said yieldable cover being adapted to support an abrasive cover upon said yieldable cover, and a pair of clamping jawsv disposed respectively inside and outside of said yieldable cover, said jaws being constructed and arranged to grip both the abrasive cover and said yieldable cover and to move inwardly of said body to tension the abrasive cover.

2. in abrading tool comprising a supporting body, an inner cover of yieldable material for said body, an outer c ver of yieldable material carried upon said inner yieldable cover, said body and said yieldable covers being adapted to support an abrasive cover, a clamping aw supported by said body inside of said outer yieldable cover, said inner yieldable cover being recessed to accommodate said clamping jaw, and a second clamping jaw supported by said body outside of said outer yieldable cover, said clamping jaws being constructed and arranged to grip theabrasive cover and said outer yieldable cover.

3. An abrading tool comprising a roll adapted to receive and support an abrasive cover, a plurality of clamping hooks, a plurality of abutment members for co-operating respectively with said clamping hooks to hold the abrasive cover upon said roll, means for yieldngly urging said abut-ment members outwardly, and a single member engagingall of said abutment members and constructed and arranged to limit the outward movement of said abutment members.

4. A rotary abrading tool comprising a roll body adapted to receive and support an abrasive cover, a plurality of hooks for holding the abrasive cover 1n place, said hooks each having a straight shank portion With a notch formed in a side of the shank portion, an

actuator bar movable with respect to said body Jfor tightening said hooks to clamp the abrasive cover to the body and for releasing said hooks to unclamp the cover, said actuator bar having a plurality of sockets to receive respectively the shanks of said hooks and having a straight groove extending substantially the length of the actuator bar and communicating With each of said sockets, and a stra-ight locking bar slidably mounted'in the groove in said actuator bar and engageable with the notches in said hooks to lock said hooks to said actuator bar.

5. A rotary abi-ading tool comprising a roll body adapted to receive and support an abra.- sive cover, a plurality of hooks for holding the abrasive cover in place, said hooks each having a shank portion with a recess therein, an actuator bar movable With respect to said body for tightening said hooks to clamp the abrasive cover to the body and for releasing said hooks to unclamp the cover, said actuator bar having a plurality of sockets to receive respectively the Shanks of said hooks and having a longitudinal recess communieating with each of said sockets, and a locking bar adapted to enter the recess in said actuator bar and the recesses in said hooks to lock said hooks to said actuator bar, said locking bar having a plurality of recesses adjacent respectively to said hooks and which upon longitudinal movement of said locking bar with respect to said actuating bar Will register with said hooks to unlock the latter simultaneously.

In testimony Whereot` l have signed my name to this specification.

. Y ERNEST HOPE.

CERTiFiCATE OF CORRECTION.

Patent No. 1,891,985. December 27, 1932.

ERNEST HOPE.

it is hereby certified that error appears in the printed specification of the aiiove numbered patent requiring correction as follows: Page 1, line 57, beginning with the word "plate" strike out all to and including "notches" in line 59, and insert instead "is made in the form of a plate or bar having recesses"; and that the said Letters Patent should be read withthis correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this Sth day of August, A. D. 1933.

M. J. Moore. (Seal) Acting Commissioner of Patents. 

